Regulation of sulphur assimilation in lettuce plants in the presence of selenium |
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Authors: | Juan J Ríos Begoña Blasco Luís M Cervilla María M Rubio-Wilhelmi Juan M Ruiz Luis Romero |
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Institution: | (1) Department of Plant Physiology, Faculty of Science, University of Granada, Avd. Fuente nueva s/n., 18071 Granada, Spain |
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Abstract: | Selenium (Se) is considered an essential trace element for animals because of its nutritional and clinical value, including
its special relevance in cancer prevention, and thus Se is at present used in biofortification programmes. However, possible
effects of Se application on S metabolism and plant growth are still not clear. Thus, we analysed the effect that Se application
in two different forms (selenate versus selenite) exerts on the S metabolism in lettuce plants grown for 66 days. Our results
indicate that the application of selenite as opposed to selenate does not affect the foliar concentration of S. With respect
to different enzymes in charge of sulphate (SO42−) assimilation, the ATP-sulphurylase activity varies only with the application of different rates of selenate, while the activity
of O-acetylserine(thiol)lyase (OAS-TL) and serine-acetyltransferase (SAT) increase in activity mainly when selenite is applied.
Finally, the concentration of cysteine (Cys) and total thiols (SH-total), fundamentally in the selenate treatments, increased
with shoot biomass. In conclusion, this study confirms that the form and application rate of Se affects S assimilation, selenate
being the more suitable form to improve effectiveness of the biofortification programme with this trace element. |
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Keywords: | Cysteine O-acetylserine(thiol)lyase Selenium Serine-acetyltransferase Sulphur assimilation |
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